ML19308D557
| ML19308D557 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 07/28/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D554 | List: |
| References | |
| NUDOCS 8002280987 | |
| Download: ML19308D557 (2) | |
Text
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EVENT DESCRIPTION gg l In mode 2 operation while performing operability test of rod 3 group 6 API, the absolute j
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Ql position indication for all regulating rods was lost, creating a ec.2dition as defined 7 89 L
Ql by Tech Spec 3.0.3.
Redundancy was maintained with the relative position indication.
7 89 L l Ql This was a non-repetitive occurrence. Maintenance restored the API system operable 7 09 (LER 77-75)
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7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION
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l The 15 volt power supplies for the API system crowbarred due to a spike of unknown e
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NA 7 89 11.12 SC OFFSITE CONSECUENCES
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}l See attached Supplementary Information as89 8 0 02 280 fp 7 89 to NAME:
W. P. Stewart (813) 866-4159 PHONE:
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SUPPLDfENTARY INFORMATION
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Report No.: 302/77-75 2.
Facility:
Crystal River Unit #3 4
3.
Report Date:
28 July 1977 4.
Occurrence Date:
2 July 1977 5.
Identification of Occurrence:
The loss of all absolute position indication resulted in a limiting condition for operation in excess of those addressed in the Specifications as defined by Technical Specification 3.0.3.
6.
Conditions Prior to Occurrence:
Mode 2 startup operation.
7.
Description of Occurrence:
At 0435 while performing operability test of the absolute position indication of rod 3 of group 6, the absolute position indication for all rods was lost. The Electrical Supervisor i was immediately notified and preparations were made to go to hot standby within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />, as required by Technical Specifications. The v.ssolute position indication system was restored operable within 8 minutes.
Designation of Apparent Cause:
An apparent, spike from an unknown origin causet a crowbar of the API 15 alt power supplies. The power supplies were reset and th 1 API system restored operable.
9.
Analysis of Occurrence:
3 There were no safety implications as a result of this occurrence.
10.
Corrective Action:
No corrective action deemed necessary as normal maintenance restored system operability.
11.
Failure Data:
i This was not a repetitive occurrence.
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